-
Lymphatic system consist of
- lymp
- lymphatic vessels
- lymphatic tissue
- lymphoid organs
-
Pas Lymph?
Bone marrow, teeth, CNS
-
Functions of the lymphatic system
- Fluid balance
- Protection
- Intestinal absorption of fats and fatsoluble vitamins
-
Lymph
- When interstatial fluid enters lymphatic vessels
- clear fluid formed from plasma during capillary exchange
water, electrolytes, waste from metabolizing cells, protein
-
Where does lymp return to?
veinssssss
-
Lymphatic circulation
- One way system
- begins in tissues
- ends in blood stream
-
Lymphatic capillaries
More permeable than blood caillaries.
-
lacteals
specialized lymphatic caillary that absorbs digested fats
-
Lymphatic vessels
drain through ymph nodes that filter the lymp. carry lymph away from the nodes. drains into right lymphatic duct or thoracic duct and empties into bloodstream near <3
-
Right lymphatic duct
- Short vessel
- Receive lymph from superior right quadrant
- empties into right subclavian vein
- (2 valves)
-
Thoracic duct (left lymphatic ducts)
- Larger vessel
- receives lymp from all part of body except those superior to the diaphragm on the right side
- Empties into left subclavian vein
- Two valves
-
Cisterna chyli
the ducts first part is enlarged
-
Chyle
- milky fluid that drains from the intestinal lacteals
- Lymph + fat globules = chyle
-
Movement of lymph
- valves
- Segments of vessels located between valves contract thythmicallyl
- skeletal muscles compress vessels and drive lymp
- breathing
-
Lymphoid organs*
- Lymph nodes
- Tonsils
- Thymus gland
- Spleen
-
lymph nodes
- small rounded masses of lymphatic tissue
- -filters lymph as it flows through the lymphatic system
-
Cervical nodes
located in the neck and drain and cleanse lymph from the head and neck areas
-
axillary nodes
- in the pits
- drain and cleanse lymph from upper extremities, shoulders, breast area
-
tracheobronchial nodes
near trachea and larger bronchial tubes
-
mesenteric nodes
abdominal cavity (100-150 of these nodes)
-
Inguinal nodes
- In the groin
- drain and cleanse lymph from the lower extremities and external genitalia
-
hilum
intended area, exit point for efferent lymphatics
-
sinuses
lymph filled spaces
-
Tonsils
- Partially encapsulated lymphoid tissue
- remove contaminants and trap pathogens
-
palatine tonsils
- opening of oral cavity into pharynx
- oval bodies located at each side of the soft palate
-
Pharyngeal tonsides (adenoids)
Opening of nasal cavity in upper pharynx
-
lingual tonsils
back of the tongue
-
spleen
- largest lymphoid organ
- cleanses blood
- destroys old and worn out RBC
- produces RBC before birth
- Resevoir for blood
- Flattened organ
- Left hypochondriac region sur the diaphragm portected by rids
-
Thymus
- key role in immune system development
- produces thymosin
- develops T cells
- Promotes lymphocyte growth
- Promotes lymphoid tissue
- Located in the mediastinum of the thoracic cavity
- shrinks after pubery and is replaced by CT
-
Other lymphoid tissue
- Appendix attached to the first part of the large intestine
- Mucosal assoiated lymphoid tissue (MALT)
- gut associated lymphoid tissue (GALT)
- -ex: peyer patches
-
Reticuloendothelial system
Responsible for destroying worn out blood cells backeria cancer cells and other harmful substances
-
-
|
|